It is not uncommon to find that the positive effects promised by retailers and manufacturers of diet pills are not backed-up by valid scientific tests, and this is especially true in the herbal diet pills / nutritional supplement market. Of the large number of diet pills available on the market, few actually contain ingredients that have been shown to improve weight loss results. The Weight Loss Institute has researched different diet pills - both herbal nutritional supplements and prescription diet pills - to determine which diet pills we believe can assist patients in reaching their weight loss goals, together with a sensible diet. Of all the diet pills that we have investigated only a few are recommended, although a larger selection has been awarded with ratings in our diet pills comparison chart. The Weight Loss Institute offer a small selection of diet pills for sale, and only those that we believe are safe and can be of assistance when trying to lose weight.